The only reason that Seth is tired of doing all those shows is probably because he's burnt out. FOX is kind of stretching him too thin with Family Guy, American Dad, and this spin off that isn't even his show, like somebody here said, it's Mike Henry's show. It's just a character that was spun-off of Family Guy(Which I still kind of enjoy but not as much as I used to). Everybody is talking about how awesome American Dad is but I haven't really been into it as much as I used to. Also, I enjoy Bob's Burgers, it's an.....interesting show. I don't know how long the Cleveland Show will last on Adult Swim but it's good that they are at LEAST trying to put it on there because that seems to be life support to all cancelled cartoons from Fox. Futurama, Family Guy got back on the air with new episodes from there, and King of the Hill, while not having new episodes, is apparently enjoying halfway decent ratings.
Daniel